Electric-arc lamp



(No Model.)

" R. M.- HUNTER.

BLEG'IRIG ARC LAMP.

No. 509,167. Patented Nov. 21, 1893..

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v. m P M o c a m N P A n n o n W L L A m m l H T UNITED STATES PATENT Orricn.

RUDOLPH M. HUNTER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE THOMSON-HOUSTON ELECTRIC COMPANY, OF CONNECTICUT.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 509,167, dated November 21, 1893.

Application filed June 29, 1893. Serial No. 479,117. (No model.)

To @ZZ whom t may concern.-

Be it known that I, RUDOLPH M. HUNTER, of the city and county of Philadelphia and State of Pennsylvania, have invented an Improvement in Electric Lamps, of which the following is a specification.

My invention has reference to electric lamps for street lighting, and consists of certain improvements which are fully set forth in the following specification and shown in the accompanying drawings which form a part thereof.

This application, Case No. 256, relates to certain improvements upon the general construction of electric lamp post and lamp set out in Letters Patent No. 493,360, granted to me on March 14, 1893, and comprehends certain details of construction whereby the general principle of the lamp structures specified in the said patent is better adapted to general use. r

The essential feature of the construction of the lamp to which this invention relates resides in the fact that the lamp post proper carries a laterally projecting arm to the outer end of which the carbon holders and feeding devices for the carbon are alone supported, while the heavy electric regulating devices are sustained upon or close to the vertical part of the posts proper.

My present improvement includes, among other things, certain specific constructions of the lamp post whereby it is particularly adapted to support the electric regulator and the carbon feeding devices or lamp proper; and further certainimprovements in the electric regulator; and finally to minor details of construction which will be better understood by reference to the accompanying drawings, in which- Figure l is a side elevation of an electric street lamp embodying my invention. Fig. 2 is a sectional elevation of the electric regulator and upper portion of the lamp post; and

A Fig. 3 is a sectional elevation of the outer end of the arm of the lamp post showing the connection with the lamp proper.

A is the vertical or upright part of the lamp post, and C is a laterally and upwardly projecting curved arm connected at its lower part with the upper portion of the lamp post A and carrying at its outer end a suitable support for'the lamp proper F. The post A is shown as formed of several sections of wrought iron tubing secured together by suitable couplings. Immediately upon the top of the post A is a short section of tubing K in which the electric lamp proper is located as is very clearly shown in Fig. 2. The arm C is composed of two o'r more light tubes C suitably curved, and if desired clamped in definite and relative relation by spiders or spacing irons c. The curvature of the arm preferred is that shown in Fig. l as the same has the necessary rigidity and at the sametime combines the upward reach with beauty of design. I have found in practice that this style of arm is exceedingly well adapted to the purpose and is highly ornamental. Further-- more a curvature of this character in the arm C enables the height of the post A to be a minimum with proper support of the lamp F above the roadway. Between the upper and lower tubesI have used an ornamental scroll C2 with excellent artistic effect combined with increased stability since the said scroll acts more or less as a truss. At the base of the arm C the ends of the tubes are supported in sockets formed in the lcollar or ring casting B which is bolted or clamped to the upper part of the post A as is clearly shown. The upper tube C of the arm is clamped to the small section of tubing K at or about its middle by a clamping band K. In this manner the base of the arm has a wide support and is firmly held against sagging at its outer end. The outer ends of thefour tubes C are bent downward and secured to a head D. Bolted to the head D and insulated therefrom is a tubular casting D to which the guide frame E is secured and which carries the protecting hood or casing c. The lamp F hasits upper part made cylindrical and adapted to be drawn up between the guides E until its upper part reaches the lower portion of the casting D against which it is firmly held. The lamp is provided With terminalss which connect with the spring contacts S, S, carried by the guide frame E and respectively in circuit with the two wires for supplying current to the lamp, the said wires being indicated as 3, t and 5, in Figs. 2 and 3, and to which wires reference will be made later on. The

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specific construction of the lamp E forms no part of this application as it forms subject matter of my application, Case No. 257, filed June 29, 1893, Serial No. 479,118.

This lamp is provided, as in the case of the lamp of my Patent No. 493,360, aforesaid, with an upwardly projecting and movable part f, which is raised and lowered by springs in accordance with and controlled by the electric regulator. A lever 1 pivoted to the tubular casting D under the action of a spring t' depresses the movable part f to feed the carbons downward, whereas the spring within the lamp raises the movable part f and the carbons when the electric regulator pulls upon the lever l through the media found in the lwire I. The lamp is sustained in its guides E by means of lifting cables G passing'over pulleys G in the casting Dand connecting' with lifting rods g carried by the lamp and substantially of the character shown in the aforesaid Letters Patent and more particularly in my application to which reference has been made. The lifting cords G pass over guide pulleys tion the collar B and are fastened to a cleat T to keep the lamp in its elevated position.

rllhe electric regulator consists of a brass tube lM secured to a cap 7c fastened to the top of the tube K. Secured to this brass tube M is acoarse wire coil N and a fine wire or shunt coilJG, said coils being arranged at a distance apart. Moving within the tube are two cores P, Pconnected by a brass rod p. The core P is adapted to be drawn down into the solenoid N, and the core P' adapted to be drawn' upward into the solenoid O. These cores are connected by a rod L with a bell crank lever L pivoted to the cap 7c and connecting directlywith the tension wire I leading to the lever 1 which controls the feeding of the carbous of thelamp. Asmall insulator J may be inserted in the wire l to prevent any possibility of short circuiting in the case of accident. An invertedcup shaped cap Z is carried upon the upper end of the rod L' so as to keep water The weight of the cores Pand'PI have found in practice amply suf-f outof the tube M.

cient to keep the wire l under tension and to properly operate in a lampfof this character. 4But it is quite evident that if desired a` spring may be employed to assist the action ofthe said wei ght. The current from the line leads by wire l, through the coarse wire solenoid N, 'thence lby wire 2 to the wire 3 which passesup through one of the tubes C of the arm C to twhich is to be connected with one of -the spring contacts S. After vleaving the lamp the current returns by the other contact S and bya wire passes through another tube C of the arnrC back to 5 and thence'passes to the line 6. A shunt circuit 7 passes from the Awire 1 through the shunt solenoid O and connects with theline 6.

Arranged between the solenoid N and O is an insulator q about which is wrapped a resistance wire of German silver Q. A circuit S leading from the line 1 connects `with the resistance coil Q which also connects by a wire 9 with one of the spring contacts r. The other spring contact r connects by a wire 10 with the wire? and by it with the line G. Thelower end of the solenoid P has an insulated circuit closing bar R. If from any cause the lamp should go out and could not reset itself, the coarse wire coil N would be thrown out of circuit, and the shunt coil O would draw its core P upward with suitable force completing the main circuit through the resist-r ance Q which is thus substituted for the resistance of the lamp. This saves the shunt coil from being burned out and also maintains the line in operative condition. The coarse wire and fine wire solenoids and their cores i operate on the differential principle as is customary in nearly all arc lamps, and need not be described.

My improvements are especially ladapted to the details of construction of the lamp post whereby it is particularly adapted to street lighting Whilemaintainng an ornamental appearance to the eye. The objectof locating the electric regulator upon the lamp post proper is to reduceto a minimum the weight at the extremity of the arm, by removing from the structure of the lamp proper all the weighty part of anarc lamp. `By act ual construction I have found thata double or all night lamp may be constructed embodying my `invention which shall have not more than one fifth the weightof an-ordinary commercial electric lamp, from which it is apparent that the arm C may be made very `light and graceful. The arm may be a fixture, and the lamp proper be readily raised Vand lowered by the cords G'. Then `lowered, and when the lamp is being trimmed, ltheelectric circuit is broken so that there is `no possibility of dangertothe trimmer. "The `moment the lamp is drawn into -its guides `it is coupled into circuit automatically.

It is quite .evident that in place of separating the high and low resistance soleuoids as shown in Fig. 2, thelhigh resistance solenoid O might have been placed above the low resistance solenoid N whereby both would act upon the same core P, but I prefer the construction shown for the reason that while `it `does not differ in principle of operation, the

cores, P, P', are more readily guided and prevented from binding, and from a practical standpoint make the regulator moreseusitive. It has a further advantage in that the solenoids are kept sul'lciently apart `to permit each to perform its full function according to the current flowing, thusmaking the action upon the cores more positive. The cores P and P taken together in connection with their connecting rod p constitute in effect a magnetic armature or movable magnetic part. This magnetic or movable part may be greatly modified as to details Without changing the method of operation.

Vthile I prefer the construction herein illus- IIC trated as being excellently adapted in practice to the carrying out of my invention,I do not coniine myselt' to the details thereof as they may be modified in various ways without departing from the principles of my invention.

What I claim as new, and desire to secure by Letters Patent, is-

1. A vertical pole having a tubular part at the top and a laterally projecting arm carried at the upper part of the pole, in combination with an electric lamp regulator proper supported in the tubular part arranged upon the upper portion ot the pole, and a connecting wire between the electric regulator and lamp proper whereby the latter may be controlled by the electric regulator.

2. The combination ot' a vertical pole having a tubular part at the top and a laterally projecting arm carried at the upper part of the pole, with an electric lamp proper supported at the free end of the arm, an electric regulator supported in the tubular part arranged upon the upper portion of the pole, a connecting wire between the electric regulator and lamp proper whereby the latter may be controlled by the electric regulator, and an electric cutout switch also arranged in the tubular part upon the upper part of the pole.

3. The combination of a vertical pole having a tubular part at the top and a laterally projecting arm carried at the upper part of the pole, with an electric lamp proper supported at the free end of the arm, an electric regulator supported in the tubular part arranged upon the upper portion of the pole consistingof a coarse wire solenoid and a tine wire solenoid arranged one above the other and a core or cores adapted to move within the solenoids and suspended at the top by a movable support, and a connecting wire between the electric regulator and lamp proper whereby the latter may be controlled by the electric regulator.

4. An electric lamp post consisting of a vertical pole having at its top a tubular portion, combined with an electric regulator for the lamp proper located within the said tubular portion and shielded thereby.

5. An electric lamp post consisting of a vertical pole having at its top a tubular portion, combined with an electric regulator for the lamp proper located within the said tubular portion and shielded thereby said regulator consisting of a high and low resistance solenoid arranged one above the otherand adapted to operate upon a movably suspended magnetic part or armature.

6. An electric lamp post consisting of a vertical pole having at its top a tubular portion, combined with an electric regulator for the lamp proper located within the said tubular portion and shielded thereby said regulator consisting of a high and low resistance solenoid arranged one above the other and adapted to operate upon a movably suspended magnetic part or armature, and a cnt out also arranged within and shielded by the tubular part on top of the post and operated by the movable magnetic part or armature.

7 An electric lamp post consisting of a vertical pole having a laterally projecting arm'I permanently attached to the top of the pole, in combination with a detachable lamp supported at the free end of the arm, means to raise and support the lamp in position upon the free end of the arm, a compartment or tubular case arranged upon the upper part of the pole, an electric regulator arranged within said compartment or tubular case, and power transmitting devices extending from the electric regulator to the lamp.

8. An electric lamp post consisting of a vertical pole having a laterally projecting arm permanently attached to the top of the pole, in combination with a detachable lamp-supported at the free end of the arm, means to raise and support the lamp in position upon the free end of the arm, a compartment or tubular case arranged upon the upper part of the pole an electric regulator arranged within the said compartment or tubular case,

power transmitting devices extending from the electric regulator to the lamp consisting ot' a wire a `bell crank at each end a spring to pull the wire in one direction and a connection between the bell crank at the free end of the wire and the movable core ofthe electric regulator whereby the latter acts in opposition to the spring to keep the wire under tension and at the same time permit it to move bodily under the action of the electric regulator.

9. In an electric lamp, the combination of a vertical pole provided with a laterally eX- tending arm; a lamp proper carried at the extremity of the arm, a tubularpart arranged upon the upper part of the pole; an electric regulator arranged in the tubular part consisting of high and low resistance solenoids supported upon a tubular support of diamagnetic material and a movable core structure movable within the diamagnetic support; and power transmitting connections between the movable core structure and the lamp proper.

l0. In an electric lamp, the combination of a vertical pole provided with a laterally cxn tending arm, a lamp proper carried at the extremity of the arm, a tubular part arranged upon the top of the pole, an electric regulator arranged in the tubular part consisting of high and low resistance solenoids supported upon a tubular support of diamagnetic material and a movable core structure movable within the diamagnetic su pport, power transmitting connections between the movable core structure and the lamp proper, a resistance coil supported upon the diamagnetic support, cut out terminals also supported upon the diamagnetic support, a cut out switch carried by and moving with the core structure and electric circuits including the solenoid, resistance coil and lamp structure.

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l1. In an electric lamp, the combination oi"` support for a lamp.

12. In an electric lamp, the combination ot'. a vertical pole combined with a laterally and upwardly extending .curved arm formed lof two or morecurved tubes spreading as they approach theverticaltube and clamped thereto `and having theextreme outer and upper end downwardly curved and provided with al supportfor a lamp, and a reinforcing Atruss orscroll work interposed between the upper and lowertubes forming the arm.

13. In an electric lamp, thecombination of a vertical pole, an upwardly'and laterally ex-` tending arm formed .of ltwo or more tubes unitedat the outer endin a support `for an electric lamp and spreadingas they approach the vertical pole, and clamps encircling `the polefand provided with sockets to receive the tubes formingthe arm.

14. The combinationof thepole Afthearm l.

Cformed of tubes C', supporting or clamping ring B for connecting the arm to thepole, the

`the tubular part S supported by the head D, Athe lamp guide frame E secured to the tu bu- 'lar part D and provided with the spring contacts S, S, ashield or hood e carried upon said `lamp guide frameE, a lamp F .having terminal contacts and lneansfor elevating the lamp into the guide iframe.

16. An electric lamp provided withan electric regulator consisting of a movable core structure combined with high and low resistance solenoids,a cut out resistance, :and a cutout switch deviceall arranged inthe same cylindrical case and .in which thecntont device is directly operated `by the movable core structure.

In testimony of which invention I have hereunto Set `myihand.

R. M. HUNTER.

Witnesses: HELEN L. MOTHERWELL, ERNEST `HOWARD HUNTER. 

